/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2002 Xodnizel
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * (VRC4 mapper)
 */

#include "mapinc.h"

#define K4buf mapbyte2



DECLFW(Mapper22_write) {
	if (A <= 0xAFFF) {
		switch (A & 0xF000) {
		case 0x8000: ROM_BANK8(0x8000, V); break;
		case 0xa000: ROM_BANK8(0xA000, V); break;
		case 0x9000: switch (V & 3) {
			case 0x00: MIRROR_SET2(1); break;
			case 0x01: MIRROR_SET2(0); break;
			case 0x02: onemir(0); break;
			case 0x03: onemir(1); break;
		}
			break;
		}
	}else   {
		A &= 0xF003;
		if (A >= 0xb000 && A <= 0xe003) {
			int x = (A & 1) | ((A - 0xB000) >> 11);

			K4buf[x] &= (0xF0) >> ((A & 2) << 1);
			K4buf[x] |= (V & 0xF) << ((A & 2) << 1);
			VROM_BANK1(x << 10, K4buf[x] >> 1);
		}
	}
}


void Mapper22_init(void) {
	SetWriteHandler(0x8000, 0xffff, Mapper22_write);
}
